Transparent display

ABSTRACT

A transparent display device has a first substrate, a second substrate, and a display medium disposed between the first substrate and the second substrate. A pixel unit of the transparent display includes a transparent region and a display region. In the display region, a first reflective material is disposed between the first substrate and the display medium, and a second reflective material is disposed between the second substrate and the display medium.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a division of U.S. application Ser. No. 16/952,054,filed on Nov. 18, 2020. The content of the application is incorporatedherein by reference.

BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

This application relates to a transparent display, and more specificallyto a transparent display that provides readable information for bothfront and rear side views.

2. Description of the Prior Art

The transparent displays show a visible image for both front side andrear side views. However, when characters are displayed as readable fromthe front side view, they are reversed and not easily readable from therear side view.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a transparent display device comprisinga plurality of pixel units. One of the plurality of pixel units (PX1)has a transparent region and a display region. The pixel unit comprisesa first substrate, a second substrate, and a display medium disposedbetween the first substrate and the second substrate. A first reflectivematerial is disposed in the display region and is disposed between thefirst substrate and the display medium. A second reflective material isdisposed in the display region and is disposed between the secondsubstrate and the display medium.

Another transparent display device having a first transparent displaypanel and a second transparent display panel is also disclosed, thatfurther includes a pixel unit that comprises a transparent region and adisplay region. The first transparent display panel comprises a firstreflective material, the second transparent display panel comprises asecond reflective material disposed corresponding to the firstreflective material, and the first reflective material and the secondreflective material are disposed in the display region.

These and other objectives of the present disclosure will no doubtbecome obvious to those of ordinary skill in the art after reading thefollowing detailed description of the embodiment that is illustrated inthe various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-1C illustrate three views of an embodiment of a transparentdisplay.

FIGS. 2A-2C illustrate a few variations of the embodiment of FIG. 1A.

FIGS. 3A-3C illustrate a variation of the embodiment of FIG. 1A-1C thatincludes a color filter.

FIGS. 4A-4B illustrate further variations of the embodiment of FIG.1A-1C.

FIG. 5 illustrates an additional variation of the embodiment of FIG. 1B.

FIGS. 6A-6C illustrate another embodiment of a transparent display.

FIGS. 7A-7C illustrate a variation of the embodiment of FIG. 6A-6C thatincludes a color filter.

FIGS. 8A-8C illustrate another variation of the embodiment of FIG.7A-7C.

FIGS. 9A-9B illustrate further variations of the embodiment of FIG.7A-7C.

FIGS. 10A-10B illustrate additional variations of embodiment of FIG.6A-6C.

FIG. 11 illustrates a schematic diagram of a stack of two displaypanels.

FIG. 12 illustrates a schematic diagram of the reflective materialand/or conductive lines.

DETAILED DESCRIPTION

Some words are used to refer to specific components in the wholespecification and the appended claims in this disclosure. A personskilled in the art should understand that a display device manufacturermight use different names to refer to the same components. Thisspecification is not intended to distinguish components that have thesame functions but different names. In this specification and theclaims, words such as “include”, “comprise”, and “have” are open words,and should be interpreted as “including, but not limited to”.

The directional terms mentioned herein, like “above”, “below”, “front”,“back”, “left”, and “right”, refer to the directions in the accompanyingdrawings Therefore, the directional terms are only used for illustrationinstead of limiting this disclosure. In the accompanying drawings,common features of a method, a structure and/or a material used in aspecific embodiment are shown in the drawings. However, these drawingsshould not be construed as defining or limiting the scope or nature ofthese embodiments. For example, the relative sizes, thicknesses andpositions of films, regions and/or structures may be reduced or enlargedfor clarity.

When a corresponding component such as a film or a region is referred toas being “on another component”, it may be directly on the anothercomponent, or there may be other components between the two components.In another aspect, when a component is referred to as being “directly onanother component”, there is no component between the two components. Inaddition, when a component is referred to as being “on anothercomponent”, the two components have an up and down relationship in a topview. The component may be located above or below the another component,and the up and down relationship depends on the orientation of thedevice.

Ordinal numbers used in this specification and the claims, like “first”and “second”, are used to modify the components, and do not imply orrepresent that the (or these) component (or components) has (or have)any ordinal number, and do not indicate any order between a componentand another component, or an order in a manufacturing method. Theseordinal numbers are merely used to clearly distinguish a componenthaving a name with another component having the same name. Differentterms may be used in the claims and the specification, so that a firstcomponent in the specification may be a second component in the claims.

It should be noted that, in the following embodiments, the technicalfeatures in several different embodiments may be replaced, recombined,and mixed to complete other embodiments without departing from thespirit of the disclosure.

In this application, a transparent display device may include liquidcrystal, organic light emitting diode (OLED), inorganic light emittingdiode, mini light emitting diode (Mini-LED), micro light-emitting diodes(Micro-LED), quantum dot light-emitting diode (QLED/QDLED),Electro-Phoretic, Fluorescence, Phosphor), other suitable materials orcombinations of the above materials, but the present disclosure is notlimited thereto. In some embodiments, the liquid crystal may includePolymer Network Liquid Crystal (PNLC) or Polymer Dispersed LiquidCrystal (PNLC), but the present disclosure is not limited thereto.

In addition, the appearance of the transparent display device may berectangular, circular, polygonal, a shape with curved edges, or othersuitable shapes. The transparent display device may further include adriving system, a control system, a light source system, a shelf system,etc., and peripheral systems to support the transparent display device.

In the present disclosure, the transparent display device in generalcomprises a permanent transparent region or a transparent region underswitching control. The permanent transparent region in an embodiment maybe transparent material. However, some materials may have thenon-transparent state but can be switched to transparent state undercontrol by applying a bias . In other words, the disclosure may form thetransparent region according to the actual design. In some embodiments,the transparent region may include or may not include an electrode. Ifthe electrode is included in the transparent region, it can be appliedwith an operation voltage to be normally white, which is at thetransparent state.

The disclosure of embodiments is based on the drawings as an example.However, the disclosures in the other embodiments and drawings with thefeatures described above may also fall into the protection scope of thedisclosure. In this application, a normally transparent mode display isused to describe the disclosure, but the application is not limited tothis as the teachings herein may be equally applied to a normallydiffused mode display without straying from the intended scope.

Please refer to FIG. 1A-1C. FIG. 1A is an example of front side view ofa first embodiment of the transparent display device 100 having a pixelunit of the transparent display device. In order to clearly describe thestructure, one pixel unit PX1 is shown as FIG. 1A-1C. In otherembodiments, the transparent display device 100 may include a pluralityof pixel units, but the disclosure is not limited thereto. FIG. 1B is across-sectional view of FIG. 1A along the line A→A′. FIG. 1C is a rearside view of the transparent display device 100. FIG. 1A is the icon ofFIG. 1B viewed from left to right. FIG. 1C is the icon of FIG. 1B viewedfrom right to left. As shown in the FIG. 1A-1C, the pixel unit PX1 has atransparent region R1 and the display region R2. The display region R2may include a first region R21 and a second region R22. In a front view,as shown in FIG. 1A, the first region R21 is disposed between thetransparent region R1 and the second region R22. In the presentdisclosure, for example, the display region may be used to displayimages. In the transparent region, for example, the screen or objects onthe other side can be seen from one side of the transparent displaydevice 100, but this is not limited thereto.

In other embodiments, for example, a pixel unit PX1 can be roughlydefined as surrounded by two scan lines and two data lines. In someembodiments, the two adjacent scan lines are two scan lines with thesame function, and there are no other scan lines with the same functionas the above-mentioned two scan lines between the two scan lines withthe same function. The data lines are two data lines with the samefunction and there are no other data lines with the same function as theabove two data lines between the two data lines, but the disclosure isnot limited to this. In this embodiment, a pixel unit may be a regionsurrounded by the lower edge of a scan line, the lower edge of anadjacent scan line, the left edge of a data line, and the left edge ofan adjacent data line. In other embodiments, one pixel unit may also bean region surrounded by a center line extending along the X-axisdirection of a scan line, a center line extending along the X-axisdirection of adjacent scan L, a center line extending along the Y-axisdirection of a data line, and a center line of the adjacent data lineextending along the Y axis. In other embodiments, a pixel unit can alsobe enclosed by the upper edge of the scan line, the upper edge of theadjacent scan line, the right edge of the data line, and the right edgeof the adjacent data line. However, this disclosure is not limited tothis. The pixel unit may include a part of a vertically stacked layer(or element) structure, for example, at least a part of the substrate101, a part of the substrate 102, and/or a part of the display medium.

In FIG. 1A-1C, the transparent region R1 might be transparent, whileboth of the first region R21 and the second region R22 are activeregions. In this embodiment, please refer to FIG. 1B, the pixel unit PXincludes a substrate 101, a substrate 102, and the display medium LCdisposed between the substrate 101 and the substrate 102. The materialof the substrate 101 and the substrate 102 may be, for example, aflexible substrate, a rigid substrate, or a combination thereof. Forexample, the material of the substrate 101 and the substrate 102 mayinclude plastic, glass, quartz, sapphire, polycarbonate (PC), polyimide(PI), polyethylene terephthalate (PET), other suitable transparentsubstrate materials, or a combination of the foregoing, but this is notlimited thereto. In the present disclosure, other elements (for example,transistor and/or conductive line, etc.) or layers may be disposed onthe substrate 101 which are not shown in the FIGs, but this is notlimited thereto. The above-mentioned substrate 101 and/or secondsubstrate 102 may be the same substrate as the substrates in other pixelunits.

As shown in the A-A′ cross-sectional view FIG. 1B, an electrode 111 andan electrode 112 are disposed on the substrate 101,and disposed in thefirst region R21 and the second region R22 respectively. Furthermore,the electrode 111 and the electrode 112 are disposed between thesubstrate 101 and the display medium LC. The electrode 111 and electrode112 may be pixel electrodes. In the display region R2, a reflectivematerial 109 is disposed on the electrode 111 and disposed between thesubstrate 101 and the display medium LC. The reflective material 109 andthe electrode 111 are at least partially overlapped in the normaldirection of the surface of the substrate 101 (for example, directionZ). The electrode 111 and electrode 112 in each of the first region R21and the second region R22 may be controlled separately. The material ofthe electrode 111 and the electrode 112 may include transparentconductive material, for example, indium tin oxide, indium zinc oxide,indium oxide, zinc oxide, tin oxide, organic conductive material, othersuitable materials, or a combination of the above, but the disclosure isnot limited thereto.

A direction X, a direction Y and a direction Z is labeled in FIG. 1A-1C.The direction Z is perpendicular to the upper surface or the lowersurface of the substrate 101 or the substrate 102, the direction X andthe direction Y may be parallel to the upper surface or the lowersurface of the substrate 101 or the substrate 102. The direction Z maybe perpendicular to the direction X and the direction Y, and thedirection X may be perpendicular to the direction Y. In the followingfigures, the spatial relationship in the structure may be describedaccording to the direction X, the direction Y and the direction Z.

Please continue to refer to FIG. 1B, an electrode 110 is disposed on thesubstrate 102, and disposed in the first region R21 and the secondregion R22. In the second region R22 of the display region R2, areflective material 108 is disposed on the electrode 110 and disposedbetween the substrate 102 and the display medium LC. Additionally, thereflective material 108 disposed in the second region R22 which may notbe overlapped with the reflective material 109 in the Z direction. Dueto the reflective material 108 and the reflective material 109, contentand/or the image in the first region is visible from the front side viewas indicated by the arrow 105, and content and/or the image in thesecond region R22 is visible from the rear side view, indicated by thearrow 106, and seen as correctly displayed from the front side view andthe rear side view. The reflective material 108 and the reflectivematerial 109 may be a higher reflectance material and include Ag, Agalloy, Al, and/or Al alloy and so on, but not limited to this. In thisembodiment, FIGS. 1A and 1C only show the position of reflectivematerial 108 and the reflective material 109 and omit other components.

FIGS. 2A-2C illustrate a few variations of the first embodiment showingexample divisions of at least one of pixel unit PX1 of the transparentdisplay device 100 when desired. FIG. 2A-2C are example front and/orrear display sides of the first embodiment of the transparent displaydevice. In detail, FIG. 2A-2C show the position of reflective material108 and the reflective material 109 in one pixel unit PX1.

In the FIG. 2A and FIG. 2B, the transparent area R1 may be divided into2 or more individual areas, for example, sub transparent region R11 andthe sub transparent region R12, such as having the sub transparentregion R12 separating the first region R21 and the second region R22, orperhaps placed in the midst of the first region R21 and the secondregion R22. In some embodiments, at least one of the first region R21and the second region R22 is divided into two or more sub region,perhaps with an extending portion of the transparent area R1 separatingthe at least one of the first region R21 and the second region R22 asshown in FIG. 2C. Many other arrangements are possible according todesign considerations. In detail, as shown in FIG. 2C, the reflectivematerial 108_1 and the reflective material 108_2 are disposed on thesubstrate 102 and respectively disposed in the second sub region R22_1and the second sub region R22_2. The reflective material 109_1 and thereflective material 109_2 are disposed on the substrate 101 andrespectively disposed in the first sub region R21_1 and the first subregion R21_2, but not limited to this.

FIGS. 3A-3C illustrate a variation of the embodiment that includes acolor filter 115_1˜115_3. FIG. 3A is an example front side view of theembodiment of the pixel unit PX1 of the transparent display device 100.In this embodiment, the pixel unit PX1 may include three sub pixels SB(one sub pixel SB as shown by dotted line). The structure of one subpixel SB may be the same as the pixel unit PX1 as shown in FIG. 1A. FIG.3B is a cross-sectional view of FIG. 3A along the line A→A′. FIG. 3C isa rear side view of the pixel unit PX1 of the transparent display device100. FIG. 3A is the icon of FIG. 3B viewed from left to right. FIG. 3Cis the icon of FIG. 3B viewed from right to left.

The embodiment of FIG. 3A-3C may include a color filter 115_1˜115_3,such as a Red-Green-Blue color filter, disposed on the substrate 102 anddisposed in both the first region R21 and the second region R22. Inaddition, the color filter may be disposed between the substrate 102 andthe electrode 110 (or the display medium LC). In detail, in thisembodiment, the reflective material 108 is disposed on the substrate102, the electrode 110 is disposed on the reflective material 108, andthe color filter 115_1˜115_3 is disposed between the reflective material108 and the display medium LC, but is not limited to this structure. Inthis manner, due to the arrangement of the reflective material 108, thereflective material 109 and the color filter, color content and/or theimage seen as correctly displayed from the front side view and the rearside view. In some embodiments, the color filters 115_1˜115_3 mayinclude other colors, and/or the color filters 115_1˜115_3 may have samecolor, but not limited to this.

In some embodiments, the electrode 110 may be divided into threesections respectively belong to each of the sub pixels SB. In anotherembodiment, the electrode 110 may be a common electrode overlapped withthe first region R21 and second region R22 of the one or more than onesub pixels SB, and may optionally extend into other region of thetransparent display device 100, but not limited to this.

FIGS. 4A and 4B illustrate cross-sectional views of variations of theembodiment shown as the FIG. 1B. Please refer to the FIG. 4A, theelectrode 110 and/or the electrode 111 may extend from one or both ofthe first region R21 and the second region R22 into the transparent areaR1 according to design considerations. In detail, FIG. 4A shows that theelectrode 111 extends into the transparent region R1, and FIG. 4B showsthat the electrode 110 extends into the transparent area R1, but notlimited to this. Therefore, the electrode 111 is disposed in the firstregion R21 and the transparent region R1.

In additional variations of the first embodiment of the FIG. 1B areshown in FIG. 5, which is a cross-sectional view of the transparentdisplay device 100. The pixel unit PX1 of the transparent display device100 further comprises an electrode 113 and an electrode 114 that may bedisposed in the transparent region R1. The electrode 113 and electrode114 may be respectively disposed on the substrate 101 and the substrate102. The material of the electrode here may be the same or similar tothe material of the aforementioned electrode and will not be repeatedagain. In this embodiment, the electrode 113, which is divided from theelectrode 110, is disposed on the substrate 102 and disposed in thetransparent region R1. The electrode 114, which is divided from theelectrode 111, is disposed on the substrate 101 and disposed in thetransparent region R1. Furthermore the electrode 113 is disposed betweenthe substrate 102 and the display medium LC, and the electrode 114 isdisposed between the substrate 101 and the display medium LC.

In some embodiments, when the transparent region R1 is normallytransparent, 0V or the same voltage can be applied to both of theelectrode 113 and the electrode 114 in normally transparent mode. Anyother voltage may be applied to both of the electrode 113 and theelectrode 114 to make the transparent region R1 change to the diffusestate. When the transparent region R1 is normally diffuse mode, 0V orthe same voltage can be applied to both of the electrode 113 and theelectrode 114 to make the transparent region R1 in diffuse state. Anyother voltage may be applied to both of the electrode 113 and theelectrode 114 in the transparent region R1 to make the transparentregion R1 change to the normally transparent state.

FIGS. 6A-6C illustrate another embodiment of a transparent displaydevice 200. FIG. 6A is a front side view of the embodiment of thetransparent display device 200. FIG. 6B is a cross-sectional view ofFIG. 6A along the line A→A′. FIG. 6C is a rear side view of thetransparent display device 200. FIG. 6A is the icon of FIG. 6B viewedfrom left to right. FIG. 6C is the icon of FIG. 6B viewed from right toleft. In this embodiment, viewing directions are indicated by the arrows205 and 206.

Please refer to the FIG. 6B, in this embodiment, the transparent displaydevice 200 may include a first transparent display panel 200A and asecond transparent display panel 200B overlapped with the firsttransparent display panel 200A. The transparent display device 200includes a pixel unit PX2 that comprises a transparent region R3 and adisplay region R4. In detail, the pixel unit PX2 includes the firsttransparent display panel 200A and the second transparent display panel200B which may be laminated together as shown in FIGS. 6A-6C. In thepresent disclosure, the transparent display device 200 may include aplurality of pixel units PX2, but not limited to this. In other word,the pixel unit PX2 may comprise a part of the first transparent displaypanel 200A and a part of the second transparent display panel 200B, butnot limited to this.

The first transparent display panel 200A comprises a first substrate 102a, a second substrate 101 a, and a first reflective material 108. Thesecond transparent display panel 200B comprises a third substrate 101 b,a fourth substrate 102 b, and a second reflective material 109 disposedcorresponding to the first reflective material 108, and the firstreflective material 108 and the second reflective material 109 aredisposed in the display region R4. The second substrate 101 a and thethird substrate 101 b are adjacently disposed, and the second substrate101 a and the third substrate 101 b are arranged between the firstreflective material 108 and the second reflective material 109. Thematerial of the first reflective material 108 and the second reflectivematerial 109 may comprise Ag, Ag alloy, Al, and/or Al alloy, but notlimited to this.

The first transparent display panel 200A may include a first displaymedium LC1 disposed between the first substrate 102 a and the secondsubstrate 101 a, wherein the first reflective material 108 is disposedbetween the first display medium LC1 and the second substrate 101 a. Thesecond transparent display panel 200B may include a second displaymedium LC2 disposed between the third substrate 101 b and the fourthsubstrate 102 b, and the second reflective material 109 is disposedbetween the second display medium LC2 and the third substrate 101 b.

As shown in the A-A′ cross-sectional view FIG. 6B, an electrode 110 a isdisposed on the substrate 102 a, an electrode 111 a is disposed on thesubstrate 101 a, an electrode 111 b is disposed on the substrate 101 b,and an electrode 110 b is disposed on the substrate 102 b. The materialof the electrode here may be the same or similar to the material of theaforementioned electrode and will not be repeated again.

FIGS. 7A-7C illustrate a variation of the embodiment of the FIGS. 6A-6Cin that the transparent display device 200 further includes a colorfilter CF 115 a_1˜115 a_3, and a color filter 115 b_1˜115 b_3 (similarto the color filter 115_1˜115_3 in the first embodiment) in the displayregion R4 of each of first transparent display panel 200A and secondtransparent display panel 200B.

FIG. 7A is an example front side view of an embodiment of thetransparent display device 200. FIG. 7B is a cross-sectional view ofFIG. 7A along the line A→A′. FIG. 7C is a rear side view of thetransparent display device 200. FIG. 7A is the icon of FIG. 7B viewedfrom left to right. FIG. 7C is the icon of FIG. 7B viewed from right toleft. The example may include a transparent region R3 and a displayregion R4.

In the first transparent display panel 200A, the color filter 115 a_3may be disposed between the substrate 102 a and the electrode 110 a onthe substrate 102 a. The first reflective material 108 may be disposedon the electrode 111 a on the substrate 101 a. In the second transparentdisplay panel 200B, the color filter 115 b_3 may be disposed between thesubstrate 102 b and the electrode 110 b on the substrate 102 b. Thesecond reflective material 109 may be disposed on the electrode 111 b onthe substrate 101 b.

FIGS. 8A-8C illustrate another variation of the embodiment of the FIGS.7A-7C. The transparent display device 200 of the present embodiment issimilar to that shown in FIGS. 7A-7C, except for the followingdifferences. In the present embodiment, the reflective material 108 isdisposed between the substrate 101 a and the electrode 111 a. Further,the at least one of color filters 115 a_1˜115 a_3 is disposed on thereflective material 108 and disposed between the reflective material 108and the electrode 111 a. The reflective material 109 is disposed betweenthe substrate 101 b and the electrode 111 b. Further, the at least oneof color filters 115 b_1˜115 b_3 is disposed on the reflective material109 and disposed between the reflective material 109 and the electrode111 b. However, the present disclosure is not limited thereto.

FIGS. 9A-9B illustrate further variations of the embodiment of the FIG.7B. Please refer to the FIG. 9A, the transparent display device 200 ofthe present embodiment is similar to that shown in FIG. 7B, except forthe following differences. In the present embodiment, the reflectivematerial 109 is disposed between the substrate 101 b and the electrode111 b. Further, at least one of the color filters 115 b_1˜115 b_3 isdisposed on substrate 101 b and disposed between the reflective material109 and the electrode 111 b. However, the present disclosure is notlimited thereto.

Please refer to the FIG. 9B, the transparent display device 200 of thepresent embodiment is similar to that shown in FIG. 7B, except for thefollowing differences. In the present embodiment, the at least one ofcolor filters 115 a_1˜115 a_3 is disposed on the reflective material 108and disposed between the reflective material 108 and the electrode 111a. However, the present disclosure is not limited thereto. The positionof the color filter and the reflective material can be set in a suitableposition according to actual design requirements; the present disclosureis not limited thereto.

FIGS. 10A-10B illustrate another variation of the embodiment of the FIG.6B. Please refer to the FIG. 10A, the transparent display device 200 ofthe present embodiment is similar to that shown in FIG. 6B, except forthe following differences. In the present embodiment, the electrode 111a and/or the electrode 111 b may extend from the display region R4 intothe transparent area R3 according to design considerations, but notlimited to this.

Please refer to the FIG. 10B, the transparent display device 200 of thepresent embodiment is similar to that shown in FIG. 6B, except for thefollowing differences. In the present embodiment, the electrode 110 aand/or the electrode 110 b may extend from the display region R4 intothe transparent area R3 according to design considerations, but notlimited to this.

Please refer to the FIG. 11 illustrates front side view of a stack oftwo display panels of the FIG. 7B. In the left side of FIG. 11, from afront side view of the first transparent display panel 200A which caninclude a plurality of first conductive lines such as gate lines GL1 anddata lines DL1 formed as shown. The center image shows a rear side viewof the second transparent display panel 200B which can include aplurality of second conductive lines such as gate lines GL2 and datalines DL2 formed as shown. In the right side of FIG. 11, the firsttransparent display panel 200A and the second transparent display panel200B are laminated together. In detail, FIG. 11 shows that thetransparent display panel 200 includes a plurality sub pixel unit SB.The display regions R4 (include the electrode 110 a, electrode 111 acolor filter 115 a_1˜115 a_3, and the reflective material 108) in thefirst transparent display panel 200A are not parallel to the displayregions R4 in the second transparent display panel 200B when the panelsare laminated together. In addition, at least one of the firstconductive lines, such as data lines DL1 or gate lines GL1, in the firsttransparent display panel 200A is not parallel to the at least one ofthe second conductive lines in the second transparent display panel 200Bwhen the panels are laminated together. In some embodiment, any acuteangle formed by at least one of the plurality of the first conductivelines of the first transparent display panel 200A and at least one ofthe plurality of the second conductive lines of the second transparentdisplay panel 200B could be greater than 4 degrees. Furthermore, inanother embodiment, the space or gap between two adjacent reflectivematerials could be less than 10 um. Therefore, better display qualitycan be achieved. FIG. 11 is only an example to aid in the understandingof the disclosure and the application is not limited to this.

FIG. 12 illustrates a schematic diagram of the reflective materialand/or conductive lines. As shown in FIG. 12, a plurality of gate linesGL can be disposed in parallel with each other but at an angle to thedisplay. Reflective material 308 can be disposed on at least a portionof the gate lines GL to prevent viewing of them. In other words, atleast a portion of the first conductive lines are overlapped by at leasta portion of the reflective material 308. In FIG. 12, portions of thegate lines GL that are located behind the reflective material 308 areillustrated as dashed lines.

In some embodiments, the reflective materials 308 are arranged in adirection, which can be regarded as the extension direction of thediagonal of an imaginary rectangle, the first side of the imaginaryrectangle extends in the x direction, and the second side extends in they direction. In some embodiments, the slope of the reflective material308 is less than pixel pitch y1/pixel pitch x1 or less than pixel pitchy1/sub pixel pitch x2 (wherein sub pixel pitch x2 is less than pixelpitch y1). The pixel pitch x1 in this embodiment can be defined as theminimum pitch of the same side of the data lines DL of two adjacent subpixels of the same color in the above X direction. The sub pixel pitchx2 in this embodiment can be defined as the minimum distance between thesame side edges of two adjacent data lines DL in the above X direction.The pixel pitch y1 in this embodiment can be defined as along the ydirection, the distance between the same side edges of two adjacent gatelines GL. Therefore, better display quality can be achieved.

The embodiments and variations thereof described above solve the priorart problems of reversed or difficult to read characters when viewedfrom the rear of a transparent display as well as reducing oreliminating moire when the teaching are employed in a double paneltransparent display.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the disclosure. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A transparent display device comprising aplurality of pixel units, wherein one of the plurality of pixel unitshas a transparent region and a display region, and the pixel unitcomprising: a first substrate; a second substrate; a display mediumdisposed between the first substrate and the second substrate; a firstreflective material disposed in the display region and disposed betweenthe first substrate and the display medium; and a second reflectivematerial disposed in the display region and disposed between the secondsubstrate and the display medium.
 2. The transparent display device ofclaim 1, wherein the first reflective material and the second reflectivematerial comprise at least one of Ag, Ag alloy, Al, and/or Al alloy. 3.The transparent display device of claim 1, wherein the display regioncomprises a first region and a second region, wherein in a front sideview, the first region is disposed between the transparent region andthe second region.
 4. The transparent display device of claim 3, whereinthe first reflective material is disposed in the first region, and thesecond reflective material is disposed in the second region.
 5. Thetransparent display device of claim 4, further comprising a firstelectrode and a second electrode, disposed between the first substrateand the display medium, wherein the first electrode is disposed in thefirst region, and the second electrode is disposed in the second region.6. The transparent display device of claim 5, further comprising a thirdelectrode, disposed between the first substrate and the display medium,wherein the third electrode is disposed in the transparent region. 7.The transparent display device of claim 6, wherein the first electrodeand the second electrode are controlled separately.
 8. The transparentdisplay device of claim 4, further comprising a first electrode and asecond electrode, disposed between the first substrate and the displaymedium, wherein the first electrode is disposed in the first region andthe transparent region, and the second electrode is disposed in thesecond region.
 9. The transparent display device of claim 1, furthercomprising a color filter disposed between the second substrate and thedisplay medium, wherein the color filter is disposed in the displayregion.